Genetic Diversity and Phylogeography of a Turf-Forming Cosmopolitan Marine Alga, Gelidium crinale (Gelidiales, Rhodo-Phyta)

Boo, Ga Hun; Bottalico, A.; Gall, Line Le; Yoon, Hwan Su

doi:10.3390/ijms24065263

Cited by 2 publications

(1 citation statement)

References 79 publications

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“…The cytochrome oxidase genes (e.g., Paiano and Necchi 2013) rbcL (e.g., Boo et al 2023), andITS2 (e.g., Huanel et al 2020) are used in the red algal phylogeographic literature.…”

Section: Introductionmentioning

confidence: 99%

The phylogeographic history of Gracilaria transtasmanica in Australian and New Zealand.

Mitchell¹

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Often genetic disjunctions are present in populations separated by large distances, or even across relatively short distances in some cases. Natural barrier, such as currents, sheltered bays, andextensive bodies of water can hinder gene flow, creating genetic differentiation between populations. Many studies have addressed the interaction between geographical distribution and phylogenetic relationships and have identified common patterns that are associated with events such as expansion from glacial refugia and historical land bridges following glaciations. Bioregion boundaries are defined at locations where genetic breaks are commonly observed in species and these act as guides to future studies, suggesting potential locations to sample. Sometimes observed patterns are unique, not adhering to bioregions, revealing a fundamental difference in the gene flow of the species and its populations. This field of research is termed phylogeography and has been pivotal in combining macro and microevolutionary principles of population genetics and phylogenetics since its inception in 1987. The field has benefited from the advent of modern molecular tools, mostly from the improvement in DNA sequencing methods, allowing large amounts of sequence data to be used to provide information about haplotype frequency and diversity. Phylogeography has helped to reveal genetic patterns that would otherwise go unnoticed, such as the presence of cryptic species that are morphologically indistinguishable in the field, requiring genetics to discern. Gracilaria transtasmanica exists in Australia and New Zealand, yet only a single phylogeographic study has addressed the distribution of the species and exclusively in New Zealand. Using ITS2 and a new plastid marker, the present study expands on the knowledge of G. transtasmanica in New Zealand, and we incorporate Australian populations to compare the genetic diversity of the species in the two countries. The results from the ITS2 data indicate that the level of diversity in each country is comparable but with a distinct differentiation from one another, sharing no ribotypes. The plastid marker shows shared haplotypes but with little phylogeographic information beyond this. We also show that the distribution of G. transtasmanica is more continuous than previously shown, with populations all along the west coast of the North Island. We conclude that Australian and New Zealand populations have experienced isolation, that the origin of the species remains unclear, andthat the last glacial maximum is likely to have impacted the contemporary genetic patterns in each country.

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“…The cytochrome oxidase genes (e.g., Paiano and Necchi 2013) rbcL (e.g., Boo et al 2023), andITS2 (e.g., Huanel et al 2020) are used in the red algal phylogeographic literature.…”

Section: Introductionmentioning

confidence: 99%

The phylogeographic history of Gracilaria transtasmanica in Australian and New Zealand.

Mitchell¹

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Intertidal Species of Gelidium from the Temperate Coast of Argentina

Croce,

Freshwater

2024

Diversity

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The Gelidiales comprises economically valuable species of marine red algae that are found globally, in cold, temperate, and warm waters. Although there is much known about the species diversity and distribution of this order, it remains underexplored on the temperate coast of the Southwestern Atlantic Ocean. This study aimed to update current knowledge about the intertidal Gelidiaceae found on the temperate coast of Argentina using a combination of rbcL data and morpho-anatomical studies and to evaluate the morphological variability among species related to habitat characteristics. Three morphotypes were found at the six localities surveyed; two were identified as different morphologies of Gelidium crinale and one was identified as Gelidium carolinianum. Populations of both species were widespread and coexisted extensively from 37° S to 40° S along the Argentinean coast. G. carolinianum is newly reported in the Southern Hemisphere, indicating it has a disjunct distribution that includes the North Atlantic and Mediterranean as well. Molecular data confirmed previous reports of G. crinale in Argentina, a species that exhibited broad morphological variability among sites. The development of both spermatangia and carpogonia on the same fertile gametophyte thalli in G. crinale and G. carolinianum was described for the first time and demonstrated that they are monoecious. These findings shed light on the diversity and biogeography of Gelidiales from temperate South America.

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Genetic Diversity and Phylogeography of a Turf-Forming Cosmopolitan Marine Alga, Gelidium crinale (Gelidiales, Rhodo-Phyta)

Cited by 2 publications

References 79 publications

The phylogeographic history of Gracilaria transtasmanica in Australian and New Zealand.

The phylogeographic history of Gracilaria transtasmanica in Australian and New Zealand.

Intertidal Species of Gelidium from the Temperate Coast of Argentina

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